@Muthuvelkumaranhave you found any solution?

@Muthuvelkumaran In Pega, to execute custom JavaScript code similar to Postman's PreScript functionality, you can use a combination of JavaScript in a client-side script (in a harness or section). However, Postman.SetGlobalVariable is specific to Postman and will not work directly in Pega. Instead, you can replicate this behavior by setting values in the Pega context using JavaScript or by setting properties on the clipboard that the Connect-Rest can reference. For example, you can use JavaScript to create a dynamic authentication header by retrieving necessary values (e.g., from session variables or custom logic) and then set them into a Property on the clipboard. After that, you can pass this Property value as part of the headers in the Connect-Rest configuration. If you add the JavaScript code as a file in the harness, the script will execute as long as it’s placed within the appropriate event or function (e.g., an onload event for the section), but the SetGlobalVariable function itself will not work in this context.